FE Modelling of Tensile and Impact Behaviours of Squeeze Cast Magnesium Alloy AM60

摘要

In response to the need for reduced global emissions, thetransportation industry has been steadily increasing themagnesium content in vehicles. This trend has resulted inexperimental documentation of numerous alloy and castingcombinations, while comparatively little work has been doneregarding the development of numerical material models forvehicle crashworthiness simulations. In this study, materialmechanical behaviour was implemented into an existing materialmodel within the nonlinear FEA code LS-DYNA to emulate themechanical behaviour of squeeze cast magnesium alloy AM60with a relatively thick section of 10 mm thickness. Modelvalidation was achieved by comparing the numerical andexperimental results of a tensile test and Charpy impact event.Validation found an average absolute error of 5.44% betweennumerical and experimental tensile test data, whereas a relativelylarge discrepancy was found during Charpy evaluation. Thisdiscrepancy has been attributed to the presence of microstructureinhomogeneity in the squeeze cast magnesium alloy AM60.